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5 results for “replicate transects”
Data from: Replicate geographic transects across a hybrid zone reveal parallelism and differences in the genetic architecture of reproductive isolation
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Data from: Use of classical bird census transects as spatial replicates for hierarchical modeling of an avian community
New monitoring programs are often designed with some form of temporal replication to deal with imperfect detection by means of occupancy models. However, classical bird census data from earlier times often lack temporal replication, precluding detection-corrected inferences about occupancy. Historical data have a key role in many ecological studies intended to document range shifts, and so need to be made comparable with present‐day data by accounting for detection probability. We analyze a classical bird census conducted in the region of Murcia (SE Spain) in 1991 and 1992 and propose a solution to estimating detection probability for such historical data when used in a community occupancy model: the spatial replication of subplots nested within larger plots allows estimation of detection probability. In our study, the basic sample units were 1‐km transects, which were considered spatial replicates in two aggregation schemes. We fit two Bayesian multispecies occupancy models, one for each aggregation scheme, and evaluated the linear and quadratic effect of forest cover and temperature, and a linear effect of precipitation on species occupancy probabilities. Using spatial rather than temporal replicates allowed us to obtain individual species occupancy probabilities and species richness accounting for imperfect detection. Species‐specific occupancy and community size decreased with increasing annual mean temperature. Both aggregation schemes yielded estimates of occupancy and detectability that were highly correlated for each species, so in the design of future surveys ecological reasons and cost‐effective sampling designs should be considered to select the most suitable aggregation scheme. In conclusion, the use of spatial replication may often allow historical survey data to be applied formally hierarchical occupancy models and be compared with modern‐day data of the species community to analyze global change process.
Data from: Differential introgression across newt hybrid zones – evidence from replicated transects
<p>Genomic heterogeneity of divergence between hybridizing species may reflect heterogeneity of introgression, but also processes unrelated to hybridization. Heterogeneous introgression and its repeatability can be directly tested in natural hybrid zones by examining multiple transects. Here, we studied hybrid zones between the European newts: Lissotriton montandoni and two lineages of L. vulgaris, with replicate transects within each zone. Over 1000 nuclear genes located on a linkage map and mtDNA were investigated using geographic and genomic clines. Overall, the five transects were all similar, showing hallmarks of strong reproductive isolation: bimodal distribution of genotypes in central populations and narrow allele frequency clines. However, the extent of introgression differed between the zones, likely as a consequence of their different ages, indicated by the analysis of heterozygosity runs in diagnostic markers. In three transects genomic signatures of small-scale (ca. 2 km) zone movements were detected. We found a limited overlap of cline outliers between transects, and no evidence of stronger differentiation between zones than between transects within zones. Introgression was heterogeneous across linkage groups, with patterns of heterogeneity similar between transects and zones. Predefined candidates for increased or reduced introgression exhibited only a subtle tendency in the expected direction, suggesting that interspecific differentiation is not a reliable indicator for the strength of introgression. These hierarchically sampled hybrid zones of different ages show how introgression unfolds with time and offer an excellent opportunity to dissect the dynamics of hybridization and architecture of reproductive isolation at advanced stages of speciation.</p>
Data from: Use of classical bird census transects as spatial replicates for hierarchical modeling of an avian community
Open the record for dataset details and reuse information.
Data from: Differential introgression across newt hybrid zones – evidence from replicated transects
Open the record for dataset details and reuse information.
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